Kravtsiv L. Stressed-deformed state of steel-concrete and ferro-concrete bent elements at power and temperature influences.

Object - steel-concrete both ferro-concrete one-flying and multiflying (continuous) beams; purpose - working out of a design procedure of one-flying and multiflying (continuous) steel-concrete and ferro-concrete beams on power and intensive (fire conditions) temperature influences; methods - analytical, crossbar-iteration, sweep method; novelty - is developed a design procedure of steel-concrete and ferro-concrete beams on thermopower (including and a fire) the influences, considering variability of parametres of deformation , depending on level of power and temperature influences; nonlinear dependence between pressure and deformations in concrete, including at biaxial an intense condition; concrete model as the three-phase environment, describing non-uniform and non-stationary temperature-moisture field with the mobile vaporization boundary; the changing of the physics-mechanics characteristics on the heating; various conditions of leaning one-flying beams; simultaneously tripartite and quadrilateralheating of beams; change of the settlement scheme of not cutting beams when one of flights reaches a fire resistance limit; results - the design procedure of steel-concrete and ferro-concrete beams on temperature (including and a fire) and power influences is developed; algorithm and the calculation program is made, influence of the various protection materials on the fire-strength of the steel-concrete one-flying and continuous beams is showed; use sphere - designing, reconstruction, strengthening.